WiFi drivers gone

Merobieboy Said:

”[...]I want my wireless network card to function, because it doesn’t right now.”

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You Need to Reinstall the macOS:

Reinstalling the macOS does not rid of the install, it just fixes everything need be, by reinstalling drivers and moving items to their required locations. So, reinstall it.

To Install - Use a USB Bootable Installer:

Being that Wi-Fi is not working, the alternative way is to install this using a USB Bootable Installer. Create it using Terminal on this Mac. Enter the command provided in the following link that pertains to the macOS that is currently installed on this Mac. Use a USB Flash Drive of 8GB for this.

Go Here for the Command: How to create a bootable installer for macOS - Apple Support

Is this the Linksys adaptor you've fitted?:

If so, then you need to follow this instruction (scroll down to the OSX instruction).

Hopefully, your laptop, if that's what you are connecting to the router, has the necessary USB3 sockets.

https://www.linksys.com/us/support-article?articleNum=139086

Only certain MacBook Pro's have the necessary USB 3.0 ports: https://www.ifixit.com/Answers/View/289096/Where+are+the+USB+3.0+ports

OK, we've established that, but your model doesn't have built in ethernet, and the recommendations are that you purchase an Apple (or other third party) Thunderbolt to Gigabit Ethernet adaptor instead.

These are the necessary specs for your laptop.

This probably doesn't help given that you have already purchased the Linksys adaptor.

These may be what you need,

https://www.amazon.co.uk/s?k=Thunderbolt+to+gigabit+ethernet+adaptor&ref=nb_sb_noss_2

Back Up your Mac First:

Prior to the reinstallation, create a Time Machine Backup of your Mac, that way you will have something to restore your Mac to, should anything go wrong with the installation.

Go Here: Back up your Mac with Time Machine - Apple Support

Sorry, but beyond the info I've given you, I can't help you.